<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>
    <style> 
     #title{
            color: green;
        }
        .t1{
            color: rgb(48, 41, 141);
        }
        h1{
            color: red;
        }
       
       
    </style>
</head>
<body>
<h1 class="t1" id="title">标题</h1>
</body>
</html>